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CREATE OR REPLACE FUNCTION TRY_TO_DATE ( V_YEAR IN NUMBER, V_MONTH IN NUMBER, V_DAY IN NUMBER ) RETURN DATE DETERMINISTIC IS BEGIN RETURN TO_DATE(LPAD(V_YEAR, 4, '0') || LPAD(V_MONTH, 2, '0') || LPAD(V_DAY, 2, '0'), 'YYYY-MM-DD'); EXCEPTION WHEN OTHERS THEN RETURN NULL; END TRY_TO_DATE; /
SELECT TRY_TO_DATE(1974, 8, 21) AS VALID_YEAR, TRY_TO_DATE(NULL, 8, 21) AS NULL_YEAR, TRY_TO_DATE(2000, 2, 29) AS LEAP_YEAR, TRY_TO_DATE(1999, 2, 29) AS COMMON_YEAR FROM DUAL;
VALID_YEAR
NULL_YEAR
LEAP_YEAR
COMMON_YEAR
21-AUG-74
null
29-FEB-00
null